From 6c901ea46b0c75cbb651e95b8b8226119d657919 Mon Sep 17 00:00:00 2001
From: AliveDevil <AliveDevil@users.noreply.github.com>
Date: Thu, 30 Jan 2025 00:14:20 +0100
Subject: [PATCH] Cleanup Namespaces

---
 Data/ApplicationDbContext.cs                  |  2 +-
 ...000000000_CreateIdentitySchema.Designer.cs |  3 +-
 .../00000000000000_CreateIdentitySchema.cs    |  2 +-
 .../ApplicationDbContextModelSnapshot.cs      |  3 +-
 Directory.Build.props                         |  1 -
 Directory.Build.targets                       |  4 -
 Pages/Error.cshtml.cs                         |  2 +-
 Pages/Index.cshtml.cs                         |  2 +-
 Pages/Privacy.cshtml.cs                       |  2 +-
 Pages/Shared/_Layout.cshtml                   |  6 +-
 Pages/_ViewImports.cshtml                     |  6 +-
 Program.cs                                    | 51 +++++++++--
 README.md                                     | 84 +++++++++++++++++++
 appsettings.Development.json                  | 25 ++++++
 appsettings.json                              | 28 ++++++-
 ext/kea/kea-leases4.csv                       |  6 ++
 ext/kea/kea-leases6.csv                       |  7 ++
 ext/powerdns/netddi.conf                      |  2 +
 ext/systemd/netddi.service                    | 11 +++
 ext/systemd/netddi.socket                     |  9 ++
 global.json                                   |  5 +-
 21 files changed, 230 insertions(+), 31 deletions(-)
 create mode 100644 ext/kea/kea-leases4.csv
 create mode 100644 ext/kea/kea-leases6.csv
 create mode 100644 ext/powerdns/netddi.conf
 create mode 100644 ext/systemd/netddi.service
 create mode 100644 ext/systemd/netddi.socket

diff --git a/Data/ApplicationDbContext.cs b/Data/ApplicationDbContext.cs
index d1611ca..551a8b7 100644
--- a/Data/ApplicationDbContext.cs
+++ b/Data/ApplicationDbContext.cs
@@ -1,7 +1,7 @@
 using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore;
 
-namespace netddi.Data;
+namespace DotNetDDI.Data;
 
 public class ApplicationDbContext : IdentityDbContext
 {
diff --git a/Data/Migrations/00000000000000_CreateIdentitySchema.Designer.cs b/Data/Migrations/00000000000000_CreateIdentitySchema.Designer.cs
index e3f5796..fc75504 100644
--- a/Data/Migrations/00000000000000_CreateIdentitySchema.Designer.cs
+++ b/Data/Migrations/00000000000000_CreateIdentitySchema.Designer.cs
@@ -1,12 +1,11 @@
 // <auto-generated />
 using System;
-using netddi.Data;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 
-namespace netddi.Data.Migrations
+namespace DotNetDDI.Data.Migrations
 {
     [DbContext(typeof(ApplicationDbContext))]
     [Migration("00000000000000_CreateIdentitySchema")]
diff --git a/Data/Migrations/00000000000000_CreateIdentitySchema.cs b/Data/Migrations/00000000000000_CreateIdentitySchema.cs
index b76e608..a3f0be1 100644
--- a/Data/Migrations/00000000000000_CreateIdentitySchema.cs
+++ b/Data/Migrations/00000000000000_CreateIdentitySchema.cs
@@ -1,7 +1,7 @@
 using System;
 using Microsoft.EntityFrameworkCore.Migrations;
 
-namespace netddi.Data.Migrations
+namespace DotNetDDI.Data.Migrations
 {
     public partial class CreateIdentitySchema : Migration
     {
diff --git a/Data/Migrations/ApplicationDbContextModelSnapshot.cs b/Data/Migrations/ApplicationDbContextModelSnapshot.cs
index 129cef9..b9ca9e4 100644
--- a/Data/Migrations/ApplicationDbContextModelSnapshot.cs
+++ b/Data/Migrations/ApplicationDbContextModelSnapshot.cs
@@ -1,11 +1,10 @@
 // <auto-generated />
 using System;
-using netddi.Data;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 
-namespace netddi.Data.Migrations
+namespace DotNetDDI.Data.Migrations
 {
     [DbContext(typeof(ApplicationDbContext))]
     partial class ApplicationDbContextModelSnapshot : ModelSnapshot
diff --git a/Directory.Build.props b/Directory.Build.props
index a88390e..be73aad 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,5 +1,4 @@
 <Project>
-  <!-- See https://aka.ms/dotnet/msbuild/customize for more details on customizing your build -->
   <PropertyGroup>
 
     <ArtifactsPath>$(MSBuildThisFileDirectory)artifacts</ArtifactsPath>
diff --git a/Directory.Build.targets b/Directory.Build.targets
index cdf451d..8c119d5 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -1,6 +1,2 @@
 <Project>
-  <!-- See https://aka.ms/dotnet/msbuild/customize for more details on customizing your build -->
-  <Target Name="CustomAfterBuildTarget" AfterTargets="Build">
-      <Message Text="Hello from CustomAfterBuildTarget" Importance="high" />
-  </Target>
 </Project>
diff --git a/Pages/Error.cshtml.cs b/Pages/Error.cshtml.cs
index eeb40fd..f5d9d81 100644
--- a/Pages/Error.cshtml.cs
+++ b/Pages/Error.cshtml.cs
@@ -2,7 +2,7 @@ using System.Diagnostics;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 
-namespace netddi.Pages;
+namespace DotNetDDI.Pages;
 
 [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
 [IgnoreAntiforgeryToken]
diff --git a/Pages/Index.cshtml.cs b/Pages/Index.cshtml.cs
index 5b37e19..1d4490a 100644
--- a/Pages/Index.cshtml.cs
+++ b/Pages/Index.cshtml.cs
@@ -1,7 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 
-namespace netddi.Pages;
+namespace DotNetDDI.Pages;
 
 public class IndexModel : PageModel
 {
diff --git a/Pages/Privacy.cshtml.cs b/Pages/Privacy.cshtml.cs
index 9d4c15b..147ad22 100644
--- a/Pages/Privacy.cshtml.cs
+++ b/Pages/Privacy.cshtml.cs
@@ -1,7 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 
-namespace netddi.Pages;
+namespace DotNetDDI.Pages;
 
 public class PrivacyModel : PageModel
 {
diff --git a/Pages/Shared/_Layout.cshtml b/Pages/Shared/_Layout.cshtml
index a26265e..91b20dd 100644
--- a/Pages/Shared/_Layout.cshtml
+++ b/Pages/Shared/_Layout.cshtml
@@ -3,7 +3,7 @@
 <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>@ViewData["Title"] - netddi</title>
+    <title>@ViewData["Title"] - .NET DDI</title>
     <script type="importmap"></script>
     <link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.min.css" />
     <link rel="stylesheet" href="~/css/site.css" asp-append-version="true" />
@@ -13,7 +13,7 @@
     <header>
         <nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-white border-bottom box-shadow mb-3">
             <div class="container">
-                <a class="navbar-brand" asp-area="" asp-page="/Index">netddi</a>
+                <a class="navbar-brand" asp-area="" asp-page="/Index">.NET DDI</a>
                 <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target=".navbar-collapse" aria-controls="navbarSupportedContent"
                         aria-expanded="false" aria-label="Toggle navigation">
                     <span class="navbar-toggler-icon"></span>
@@ -40,7 +40,7 @@
 
     <footer class="border-top footer text-muted">
         <div class="container">
-            &copy; 2025 - netddi - <a asp-area="" asp-page="/Privacy">Privacy</a>
+            &copy; 2025 - .NET DDI - <a asp-area="" asp-page="/Privacy">Privacy</a>
         </div>
     </footer>
 
diff --git a/Pages/_ViewImports.cshtml b/Pages/_ViewImports.cshtml
index 0e4344d..19b414b 100644
--- a/Pages/_ViewImports.cshtml
+++ b/Pages/_ViewImports.cshtml
@@ -1,5 +1,5 @@
 @using Microsoft.AspNetCore.Identity
-@using netddi
-@using netddi.Data
-@namespace netddi.Pages
+@using DotNetDDI
+@using DotNetDDI.Data
+@namespace DotNetDDI.Pages
 @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
diff --git a/Program.cs b/Program.cs
index a07e601..a9756c2 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1,34 +1,73 @@
+using DotNetDDI.Data;
+using DotNetDDI.Integrations.Kea;
+using DotNetDDI.Integrations.PowerDns;
+using DotNetDDI.Options;
+using DotNetDDI.Services.Dhcp;
+using DotNetDDI.Services.Dns;
+
 using Microsoft.AspNetCore.Identity;
 using Microsoft.EntityFrameworkCore;
-using netddi.Data;
+using Microsoft.AspNetCore.Connections;
 
 var builder = WebApplication.CreateBuilder(args);
+builder.Services.AddSystemd();
 
 // Add services to the container.
 var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
 builder.Services.AddDbContext<ApplicationDbContext>(options =>
-    options.UseSqlite(connectionString));
+	options.UseSqlite(connectionString));
 builder.Services.AddDatabaseDeveloperPageExceptionFilter();
 
 builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
-    .AddEntityFrameworkStores<ApplicationDbContext>();
+	.AddEntityFrameworkStores<ApplicationDbContext>();
 builder.Services.AddRazorPages();
 
+builder.Services.Configure<DhcpOptions>(builder.Configuration.GetRequiredSection("Dhcp"));
+builder.Services.Configure<PowerDnsOptions>(builder.Configuration.GetRequiredSection("PowerDns"));
+
+builder.Services.AddHostedService<DhcpWatcher>();
+builder.Services.AddHostedService<DhcpQueueWorker>();
+
+builder.Services.AddSingleton<DhcpLeaseQueue>();
+builder.Services.AddSingleton<DnsRepository>();
+
+builder.Services.AddDhcpWatcherFactory();
+builder.Services.AddKeaFactory();
+
+builder.WebHost.ConfigureKestrel((context, options) =>
+{
+	options.UseSystemd(_ => throw new InvalidOperationException("SystemD Socket Activation is not supported by Kestrel."));
+
+	var pdnsOptions = context.Configuration.GetRequiredSection("PowerDns:Listener").Get<PowerDnsListenerOptions>();
+	ArgumentNullException.ThrowIfNull(pdnsOptions);
+	var path = PathEx.ExpandPath(pdnsOptions.Socket);
+	FileInfo file = new(path);
+	file.Directory!.Create();
+	file.Delete();
+	options.ListenUnixSocket(path, options =>
+	{
+		options.UseConnectionHandler<PowerDnsHandler>();
+	});
+});
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment())
 {
-    app.UseMigrationsEndPoint();
+	app.UseMigrationsEndPoint();
 }
 else
 {
-    app.UseExceptionHandler("/Error");
+	app.UseExceptionHandler("/Error");
 }
 
 app.UseRouting();
 
-app.UseAuthorization();
+if (app.Configuration.GetValue("Admin:Authentication", true))
+{
+	app.UseAuthorization();
+}
 
 app.UseStaticFiles();
 app.MapRazorPages();
diff --git a/README.md b/README.md
index 69e60dd..cc6b58b 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,85 @@
 # .NET Dhcp Dns Ipam
+
+Enabling PowerDNS to query popular supported Dhcp-servers.
+
+This project was born out of the necessity for my home-lab network to be able to resolve both IPv4 and IPv6 addresses from one Dhcp-service.
+
+Theoretically Kea can update DNS servers using RFC2136 nsupdate-mechanisms using kea-ddns, but this interoperation can cause issues in networks with devices sharing a hostname (i.e. DHCID records), missing update requests due to service restarts or temporary connectivity issues.
+
+## Scope
+
+At the moment there is no need to implement more than is minimally required to get Dhcp4 and Dhcp6 leases queryable by PowerDNS using the memfile "database" of Kea using the remote backend with unix domain sockets.
+
+Following parts may be implemented later as I see fit:
+- Different PowerDNS remote backends
+  - mainly HTTP REST
+- Support different Kea lease databases
+  - MySQL
+  - PostgreSQL
+
+## Building
+
+Requires .NET 8 SDK<br>
+Create binary using
+> dotnet publish -c Release -p:PublishTrimmed=true -p:PublishSingleFile=true --self-contained
+
+## Usage
+
+Install, and configure Kea (optionally with Stork) Dhcp4, Dhcp6 or both.<br>
+Make sure to enable the memfile lease store.
+
+Install and configure PowerDNS, including the [remote backend](https://doc.powerdns.com/authoritative/backends/remote.html).<br>
+A sample configuration file is provided.
+
+Deploy netddi to /opt/netddi<br>
+Setup systemd using the provided socket and service units, configure as necessary.
+
+Start Kea, netddi and PowerDNS.
+
+**To be done**: Packaging for common Linux distributions.<br>
+Deb-packages (Debian)<br>
+RPM-packages (EL)
+
+### Configuration
+
+netddi can be configured using environment variables or the appsettings.json file - [Configuration#Binding hierarchies](https://learn.microsoft.com/dotnet/core/extensions/configuration#binding-hierarchies) describes the naming scheme in this section.
+
+Default configuration:
+```
+Admin:Authentication=true
+Dhcp:Kea:Dhcp4:Leases=/var/lib/kea/kea-leases4.csv
+Dhcp:Kea:Dhcp6:Leases=/var/lib/kea/kea-leases6.csv
+PowerDns:UniqueHostnames=true
+PowerDns:Listener:Socket=/run/netddi/pdns.sock
+```
+
+`Admin:Authentication` enables configuring whether the Admin interface is guarded by admin login.
+
+`Dhcp:Kea` allows configuring `Dhcp4` and `Dhcp6` lease file watchers, respective for each of both services.
+
+In `PowerDns:Listener:Socket` you can optionally configure the unix domain socket to be used in case Systemd isn't providing them (e.g. when starting the service manually).
+
+netddi continuously monitors the Dhcp service leases and upon seeing a new lease all previous records that match in hostname and lease type (IPv4, IPv6) are replaced. If you want to change this behavior you can opt-out of this behavior by setting `PowerDns:UniqueHostnames=false`.
+
+See [Logging in C#](https://learn.microsoft.com/dotnet/core/extensions/logging?tabs=command-line#configure-logging-without-code) for options related to logging.
+
+## Acknowledgments
+
+Incorporates following libraries directly:
+
+**.NET Foundation and Contributors**
+- [CommunityToolkit.HighPerformance](https://github.com/CommunityToolkit/dotnet) - MIT
+- [dotNext](https://github.com/dotnet/dotNext) - MIT
+- Several runtime libraries, as part of [.NET](https://github.com/dotnet/runtime)
+  - Microsoft.AspNetCore.App
+  - Microsoft.Extensions.Configuration.Binder
+  - Microsoft.Extensions.Hosting.Systemd
+  - System.IO.Pipelines
+
+**[Nietras](https://github.com/nietras)**
+- [Sep](https://github.com/nietras/Sep) - MIT
+
+Incorporates data structures and protocol implementations as required for interop scenarios:
+
+- [kea](https://gitlab.isc.org/isc-projects/kea) by [ISC](https://isc.org/) - MPL 2.0
+- [PowerDNS](https://github.com/PowerDNS/pdns) by [PowerDNS.COM BV](https://www.powerdns.com/) and contributors - GPL 2.0
diff --git a/appsettings.Development.json b/appsettings.Development.json
index 770d3e9..6288731 100644
--- a/appsettings.Development.json
+++ b/appsettings.Development.json
@@ -1,9 +1,34 @@
 {
+  "Admin": {
+    "Authentication": false
+  },
   "DetailedErrors": true,
+  "Dhcp": {
+    "Kea": {
+      "Dhcp4": {
+        "Leases": "../../ext/kea/kea-leases4.csv"
+      },
+      "Dhcp6": {
+        "Leases": "../../ext/kea/kea-leases6.csv"
+      }
+    }
+  },
+  "Kestrel": {
+    "Endpoints": {
+      "Http": {
+        "Url": "http://[::1]:5000"
+      }
+    }
+  },
   "Logging": {
     "LogLevel": {
       "Default": "Information",
       "Microsoft.AspNetCore": "Warning"
     }
+  },
+  "PowerDns": {
+    "Listener": {
+      "Socket": "${XDG_RUNTIME_DIR}/netddi/pdns.sock"
+    }
   }
 }
diff --git a/appsettings.json b/appsettings.json
index 56d6c35..241f1b7 100644
--- a/appsettings.json
+++ b/appsettings.json
@@ -1,12 +1,38 @@
 {
+  "Admin": {
+    "Authentication": true
+  },
+  "AllowedHosts": "*",
   "ConnectionStrings": {
     "DefaultConnection": "DataSource=app.db;Cache=Shared"
   },
+  "Dhcp": {
+    "Kea": {
+      "Dhcp4": {
+        "Leases": "/var/lib/kea/kea-leases4.csv"
+      },
+      "Dhcp6": {
+        "Leases": "/var/lib/kea/kea-leases6.csv"
+      }
+    }
+  },
+  "Kestrel": {
+    "Endpoints": {
+      "Http": {
+        "Url": "http://[::]:80"
+      }
+    }
+  },
   "Logging": {
     "LogLevel": {
       "Default": "Information",
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "PowerDns": {
+    "Listener": {
+      "Socket": "/run/netddi/pdns.sock"
+    },
+    "UniqueHostnames": true
+  }
 }
diff --git a/ext/kea/kea-leases4.csv b/ext/kea/kea-leases4.csv
new file mode 100644
index 0000000..7b9ba23
--- /dev/null
+++ b/ext/kea/kea-leases4.csv
@@ -0,0 +1,6 @@
+address,hwaddr,client_id,valid_lifetime,expire,subnet_id,fqdn_fwd,fqdn_rev,hostname,state,user_context
+192.0.2.1,06:07:08:09:0a:bc,,200,200,8,1,1,host.example.com,0,
+192.0.2.2,,,200,200,8,1,1,host.example.com,0,
+192.0.2.3,dd:de:ba:0d:1b:2e:3e:4f,0a:00:01:04,100,100,7,0,0,,1,{ "foobar": true }
+192.0.2.4,,11:22:33:44:55:66,200,200,8,1,1,host.example.com,0,
+192.0.2.5,,,200,200,8,1,1,,1,
diff --git a/ext/kea/kea-leases6.csv b/ext/kea/kea-leases6.csv
new file mode 100644
index 0000000..f51bc14
--- /dev/null
+++ b/ext/kea/kea-leases6.csv
@@ -0,0 +1,7 @@
+address,duid,valid_lifetime,expire,subnet_id,pref_lifetime,lease_type,iaid,prefix_len,fqdn_fwd,fqdn_rev,hostname,hwaddr,state,user_context,hwtype,hwaddr_source,pool_id
+2001:db8:1::1,00:01:02:03:04:05:06:0a:0b:0c:0d:0e:0f,200,200,8,100,0,7,0,1,1,host.example.com,,1,,1,0,0
+2001:db8:1::1,,200,200,8,100,0,7,0,1,1,host.example.com,,1,,1,0,0
+2001:db8:2::10,01:01:01:01:0a:01:02:03:04:05,300,300,6,150,0,8,0,0,0,,,1,,1,0,0
+3000:1::,00:01:02:03:04:05:06:0a:0b:0c:0d:0e:0f,0,200,8,0,2,16,64,0,0,,,1,{ "foobar": true },,1,0,0
+2001:db8:1::2,00:00:00,200,200,8,100,0,7,0,1,1,host.example.com,,0,,1,0,0
+2001:db8:1::3,00:00:00,200,200,8,100,0,7,0,1,1,host.example.com,,1,,1,0,0
diff --git a/ext/powerdns/netddi.conf b/ext/powerdns/netddi.conf
new file mode 100644
index 0000000..94089c4
--- /dev/null
+++ b/ext/powerdns/netddi.conf
@@ -0,0 +1,2 @@
+launch+=remote
+remote-connection-string+=unix:path=/run/netddi/pdns.sock
diff --git a/ext/systemd/netddi.service b/ext/systemd/netddi.service
new file mode 100644
index 0000000..d800a13
--- /dev/null
+++ b/ext/systemd/netddi.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=PowerDNS/DHCP Companion Remote
+Before=pdns.service
+
+[Service]
+Type=notify
+ExecStart=/opt/netddi/netddi
+WorkingDirectory=/etc/netddi
+
+[Install]
+WantedBy=multi-user.target
diff --git a/ext/systemd/netddi.socket b/ext/systemd/netddi.socket
new file mode 100644
index 0000000..1377a39
--- /dev/null
+++ b/ext/systemd/netddi.socket
@@ -0,0 +1,9 @@
+[Unit]
+Description=netddi PowerDNS Remote Socket
+
+[Socket]
+ListenStream=/run/netddi/pdns.sock
+Accept=no
+
+[Install]
+WantedBy=sockets.target
diff --git a/global.json b/global.json
index a4effd9..2c63c08 100644
--- a/global.json
+++ b/global.json
@@ -1,5 +1,2 @@
 {
-  "sdk": {
-    "version": "9.0.102"
-  }
-}
\ No newline at end of file
+}